When Jackie arrived home, she found that she's missing one button of her black jacket and it could've been left at the jail or somewhere on the way.
As part of her cautious behavior, she changed her clothes and threw it on the trash bin. She didn't need anyone to find those clothes or know it was her.
The hair clip that she left was just a clue to mess up with Vincent.
"You're throwing those clothes out?" Riley asked from the living room. She was reading the script once again and Shein was just right beside her checking on the jail's system to make sure that no other clue can be seen that could be traced back to Jackie.
"I am just being cautious."
"Oh? Is that why you left your hair clip on purpose?"
"I just want to mess with someone." Jackie had always been serious since they were young. It was a seldom occasion to see her smile but now, Riley and Shein could see the joy in her eyes.